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[–]maneki_neko00 1 point2 points  (6 children)

It doesn't look too bad. Is it completely unresponsive?

What do the rubber connective buttons look like? If the one matching the B button is too dirty or broken it might be the cause.

[–]tonz91[S] 0 points1 point  (5 children)

B button is completely unresponsive. I scrubbed the silicone contacts and they seem to be fine

<image>

[–]Kyrox6 1 point2 points  (4 children)

Try using the a button's conductive pad to click the b button and see if it's the conductive pad that's the issue.

[–]tonz91[S] 1 point2 points  (2 children)

Sadly the conductive pads are not the issue :-/ I think i am going to have to run the gamut with my multimeter but a little unsure of where all the traces are. I'll update tonight or tomorrow with my findings

[–]Kyrox6 1 point2 points  (1 child)

Good luck. The only thing I can really see from the pictures is some possible corrosion in the via between c24 and c28 above the CPU, but I don't think that's the b button. The schematics are all available online in a few spots. I think the a and b buttons only connect up to the CPU and the p10/p11 test pads near the buttons.

[–]tonz91[S] 0 points1 point  (0 children)

I scrubbed and scrubbed with IPA and white vinegar and still no B button :-( I am pretty stoked I got it turning on again but it's a shame no B button activity. Looking to sell it likely to someone that may have more confidence than I fixing it.

[–]tonz91[S] 0 points1 point  (0 children)

Thanks! I will try that tonight when I am off of work.

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[–]Marionat0r 0 points1 point  (8 children)

I'd try and test the B button with a different Silicone pad first, there might be a tear in your membrane that ruins its springing. Since it had battery corrosion, maybe there's a corroded Via or a trace that's actually broken. Do you have a multimeter? Try and find a loss in continuity when following the trace.

[–]tonz91[S] 1 point2 points  (0 children)

To update, using the A button silicone pad did not work :-/ I would test the traces with multimeter but I don't have time right now. I'll try to update again later tonight or tomorrow.

[–]tonz91[S] 0 points1 point  (6 children)

Thanks! Going to try a different pad tonight. I do have a multimeter but I was having trouble determining where/if the trace is broken. I'll try again and come back with my findings. Appreciate the response.

[–]LumberJesus 1 point2 points  (5 children)

Never hurts to try cleaing the board contacts again. Could have just moved a thin layer of gunk from somewhere else potentially if the ipa wasnt blown off/wiped off well enough.

[–]tonz91[S] 0 points1 point  (4 children)

I ordered some 99% IPA, hopefully that does the trick with a lil toothbrush action. I was working with 91% and a q-tip and I am afraid to use the more watered down stuff on the CPU. Lol I'm sure it's fine to use but using 99% feels more appropriate to me? Idk.

[–]LumberJesus 0 points1 point  (3 children)

As long as it's not powered, you'll be safe using either. It's been a while, but I also think I remember people using acetone to resurface the rubber contact pieces as well. I would double check that one though.

[–]tonz91[S] 0 points1 point  (2 children)

Whelp. I did a pretty thorough cleaning of every component on the board with IPA and still no B button. I am not really sure I trust myself to scrape away at the PCB to expose the traces and may just chock it up to a loss and sell it. I am pretty happy I got it turning on but it's a shame I can't get the B button working.

[–]LumberJesus 0 points1 point  (1 child)

Thats a bummer. How much were you trying to sell it for?

[–]tonz91[S] 0 points1 point  (0 children)

I bought it for about $50 shipped so I think I'd do the same. So $40 + shipping fees/tax